I'd considered doing that last year for the Ride 100 but in the end, because you have to be there an hour before your start time, the timings just didn't work.

I cycled over instead... The Blackwall Tunnel is closed to traffic that day but you are allowed to cycle through it which is helpful. I think it took longer to find the right start colour than it did to cycle to Stratford.

Despite Hurricane Bertha blowing through it was an awesome day although took a good few junctions before remembering that you don't have to stop at traffic lights that day!